With the new OWL view infrastructure introduced by 0134495, some parts of the right-to-left design was broken.
All the issues addressed in this commit are:
- subdropdowns are shown in the correct direction
- subdropdowns' chevrons point to the correct direction
- subdropdowns keyboard navigation with left/right arrows
- popovers' arrows point to the correct direction
- the document's `<body/>` will have the `o_rtl` CSS class
X-original-commit: 8649e46bec051e6bbe21bbdb8023f747206644af
Part-of: odoo/odoo#76444